Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe506e2be1176e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 20:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d8f78696b5e861ab53b2988153a0753 SHA-1: 08b54ac46585edbb137e2452745ac3f92b75c49c SHA-256: 4bfe506e2be1176ea78d038c58d60cc6024793e0cc47538f69c30c001f4b1040
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure the true destination or spread malicious content across many domains. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inprovitperu.com/ckfinder/userfiles/files/77935346806.pdf
    • https://europacreativaeuskadi.eu/files/galeria/files/46968913383.pdf
    • http://investbuild.ru/var/upload/file/31047886369.pdf
    • http://barahi.com/assets/userfiles/files/fomufisowonirirunusipazu.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdb7cdeff0---22503933883.pdf
    • http://simonhoirup.dk/userfiles/file/tafanowufuwiwutebopuvaj.pdf
    • https://istanajp.net/contents/files/difenefivelogudegugaleta.pdf
    • https://openkomm.yussfone-crm.com/userfiles/file/vaxanixikilejevozurejigo.pdf
    • https://www.channeloflove.com/ckfinder/userfiles/files/26416565358.pdf
    • http://rudolphi.nu/userfiles/file/tubidisovopopuzume.pdf
    • http://trans-serwis.com/userfiles/file/joxedojivixume.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/molij.pdf
    • http://nriloan.jctoursandtravels.in/files/ninopuwuroxiwanaluf.pdf
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdf
    • http://hotelborgodeipoeti.com/userfiles/files/44460144963.pdf
    • http://universalestetic.com/userfiles/file/89372479237.pdf
    • https://truckforceone.com/upload/editor/file/zepup.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/satososax.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/niwevijekof.pdf
    • http://www.fashiongale.ro/userfiles/files/jisuwegow.pdf
    • http://ildungrice.com/fileupload/fckeditor/file/dovidimoloximipisojiba.pdf
    • http://sun-green.de/ckfinder/userfiles/files/ginaxawag.pdf
    • http://pp-aqua.com/userfiles/files/6860742443.pdf
    • https://pastravariaizvoarelebratiei.ro/images/file/bawowiwufuvadufonuserosaw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=another+cinderella+story+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcfd.bin
465b81b7896e3fc4e5f64e4d18ec34ddcc6e871a158e46d753221b815f8ed03a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 17616 bytes
font_01_sfnt_off0000eb56.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 16792 bytes
font_02_sfnt_off0001036d.bin
d1f9fa410881f120a6c3645d9dc767b91031908b82eefd842797185848ab9066		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 10564 bytes

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